sof-test: change debugfs root for ipc flood test

When multiclient architecture changes are merged, defugfs root for
ipc flood test is changed to /sys/kernel/debug/ipc-flood-test/. debugfs
entries are remained same.

Signed-off-by: Fred Oh <fred.oh@linux.intel.com>

test-case/check-ipc-flood.sh

@@ -19,7 +19,7 @@ OPT_OPT_lst['c']='cnt'      OPT_DESC_lst['c']='ipc loop count'
 OPT_PARM_lst['c']=1         OPT_VALUE_lst['c']=10000
 
 OPT_OPT_lst['f']='dfs'      OPT_DESC_lst['f']='system dfs file'
-OPT_PARM_lst['f']=1         OPT_VALUE_lst['f']="/sys/kernel/debug/sof/ipc_flood_count"
+OPT_PARM_lst['f']=1         OPT_VALUE_lst['f']="/sys/kernel/debug/sof/ipc-flood-test/ipc_flood_count"
 
 OPT_OPT_lst['l']='loop'     OPT_DESC_lst['l']='loop count'
 OPT_PARM_lst['l']=1         OPT_VALUE_lst['l']=1